Polyvinyl alcohol porous material and preparation method thereof

A technology of polyvinyl alcohol and porous materials, applied in the direction of heat exchange materials, chemical instruments and methods, etc., to achieve the effects of strong adaptability, large cell density, and large compression modulus

Active Publication Date: 2017-03-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the disadvantages of existing cold-preservation materials that water will flow out after phase transformation after water absorption and freezing, the present invention provides a polyvinyl alcohol porous material, which has the advantage of not flowing when the water absorption phase changes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] The present invention also provides a preparation method for the above-mentioned polyvinyl alcohol porous material, comprising the following steps: mixing 15-45 parts by weight of a water-containing foaming agent and 40-84 parts by weight of polyvinyl alcohol pellets or powders in a closed and stirred condition Mix thoroughly at 30-80°C and swell until the surface of the pellet or powder is dry, then add 0.5-5 parts by weight of inorganic metal salt and 0.5-10 parts by weight of cell regulator, stir and mix evenly at room temperature, and then foam by molding Polyvinyl alcohol porous foams of different shapes and sizes are prepared by melting processing foaming methods such as kettle foaming or extrusion foaming.

[0031] Specifically, in the preparation method of the above-mentioned polyvinyl alcohol porous material, the specific method of molding and foaming is: place the fully swollen and uniformly mixed material in a metal mold frame, and heat it in a flat vulcanizer...

Embodiment 1

[0039] Add 84 parts of polyvinyl alcohol 1795 pellets with a water-containing foaming agent consisting of 1 part of ethanol and 14 parts of water, and then fully swell at a temperature of 80°C under airtight and stirring conditions until the surface of the pellets is dry, then add 0.5 parts of sodium chloride , 0.5 parts of boric acid were stirred and mixed evenly at room temperature. Put the fully swollen and uniformly mixed pellets in a 12cm×10cm×0.4cm metal mold frame, hold the pressure at 180°C and 15MPa pressure for 10 minutes in a hot press, quickly open the mold and release the pressure, and foam the polyethylene Alcohol porous bulk materials.

[0040] The performance indicators of the polyvinyl alcohol porous material obtained in this example are as follows: the pore size is 150-300 μm, the opening ratio is 48%, and the cell density is 1.2×10 7 cells / cm 3 , dry compression modulus 4.2MPa, water absorption 6 times, phase transition latent heat 285.2J / g after water abs...

Embodiment 2

[0042] Add 40 parts of polyvinyl alcohol 1799 pellets with water-containing foaming agent consisting of 10 parts of propanol and 35 parts of water, and then fully swell at a temperature of 35°C under airtight and stirring conditions until the surface of the pellets is dry. Add 5 parts of magnesium chloride, 10 parts of Alkylphenol polyoxyethylene ether is stirred and mixed evenly at room temperature. Place the fully swollen and uniformly mixed pellets in a metal mold frame of 8cm×8cm×0.2cm. After holding the pressure for 20 minutes at 140°C and 15MPa pressure in a hot press, the mold is quickly opened to remove the pressure, and the foam molding polymer Vinyl alcohol porous block material.

[0043] The performance indicators of the polyvinyl alcohol porous material obtained in this example are as follows: the pore size is 120-250 μm, the opening ratio is 45%, and the cell density is 1.0×10 8 cells / cm 3 , the dry compression modulus is 5.0MPa, the water absorption is 7 times,...

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Abstract

The invention specifically relates to a polyvinyl alcohol porous material and a preparation method thereof, belonging to the technical field of high polymer materials. The polyvinyl alcohol porous material provided by the invention has a pore diameter of 5 to 300 [mu]m, an opening percent of 10 to 50%, a cell density of 10<5> to 10<10> cells / cm<3>, a dry compression modulus of 4.0 to 7.5 MPa, water-absorbing capacity of 5 to 20 times and latent heat of phase change after water absorption equilibrium of 250 to 320 J / g. The polyvinyl alcohol porous material may be prepared from 40 to 84 parts of polyvinyl alcohol, 15 to 45 parts of a water-containing foaming agent, 0.5 to 5 parts of an inorganic metal salt and 0.5 to 10 parts of a cell adjusting agent by using a thermoplastic processing method. The shape of the prepared polyvinyl alcohol porous material may be diversified. The polyvinyl alcohol porous material provided by the invention has the characteristics of plasticity, no need for special packaging and repeated usability, and water adsorbed by the polyvinyl alcohol porous material does not flow when undergoing phase change after freezing; so the polyvinyl alcohol porous material is extensively applicable as a low-temperature refrigeration material for cold-chain transportation.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polyvinyl alcohol porous material and a preparation method thereof. The polyvinyl alcohol porous material can be used as a cold storage agent for cold chain transportation. Background technique [0002] Cold chain logistics refers to a complex supply chain system in which refrigerated and frozen products are always in a suitable low-temperature storage environment in all links from production, storage, transportation, sales to consumers, so as to ensure product quality and reduce loss. As the society pays more and more attention to drug quality and food safety issues and the continuous development of the online shopping industry, cold chain logistics plays an increasingly important role in the transportation of meat, poultry, aquatic products, vegetables, fruits and other fresh agricultural and sideline products, frozen food, medical drugs, etc. role. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08K3/16C08K3/30C08J9/08C09K5/06
CPCC08J9/08C08J2203/02C08J2203/18C08J2203/184C08J2329/04C08K3/16C08K3/30C08K2003/162C08K2003/166C08K2003/3045C08L29/04C09K5/063Y02E60/14
Inventor 王琪李莉贾迎宾邱文婷白时兵
Owner SICHUAN UNIV
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